Understanding and addressing methane emissions is an important step toward net zero, but traditional methodologies of reporting emissions at source level are under increasing scrutiny.
Reducing methane emissions from oil and gas operations is a key component of CNPC’s Green Action Plan. Following the success of recent methane reduction efforts, the company announced a target in July 2020 to halve upstream methane intensity by 2025.
CNPC monitors methane emissions from major sources in its full value chain of oil and gas production. Routine flaring is now avoided in both new sites and major existing major ones.
In 2019, leak detection and repair (LDAR) pilot campaigns were expanded in Dagang and other oil fields, helping to cut methane emissions by 12.3% over the year. Used comprehensively in CNPC’s downstream operations, LDAR coverage is now being expanded to all operated sites.
Finding ways to ensure recovery of associated natural gas from oil fields has become part of standard operations. Compressed natural gas integrated units are used to recover venting from remote wells that have no pipeline access, low-pressure associated gas is pressurized into gathering pipelines to make it marketable, and recovered gas is used to provide drilling power to rigs and auxiliary generators.
In the Tarim oil field, 48 gas recovery stations have been set up, with a capacity of 4.2 million cubic metres per day, while capacity at Changqing Oilfield has reached 1 billion cubic metres per year.
What OGCI member companies are doing to reduce methane emissions
Member companies are expanding leak detection and repair campaigns, removing high-emitting devices, and reducing both flaring and venting.